I know we have the saw, but is there a possibility that humans can choose between the blaster and a knife. With a knife doing higher damage, but of course being restricted to close range.
I also have an idea of a new alien building where it has something similar to vines and grabs a human and pulls them in and does small damage by restricting and clamping the human with a 5 second cooling period after the human is released. The vine could possibly be broken by the human themselves or if a team mate knives it, or does a certain amount of damage to the structure.
For stability humans could have a similar structure but it could be something like an electric shock which both hurts and slows the alien.